Answer: Aluminium isopropoxide to the carbonyl.
- A Aluminium isopropoxide to the carbonyl
- B Sodium borohydride to the carbonyl via a boron hydride complex
- C Activated zinc dust to the carbonyl in acidic medium
- D Adsorbed H<sub>2</sub> gas to the carbonyl over a Pd surface
Correct answer: A. Aluminium isopropoxide to the carbonyl
Explanation: MPV reduction uses aluminium isopropoxide; isopropanol acts as the hydride source.
Curved arrows show the nucleophile attacking the carbonyl carbon while the C=O pi electrons move onto oxygen, giving a tetrahedral alkoxide intermediate.
Concept context
Aldehydes, ketones, carboxylic acids, and their derivatives (esters, amides, acid chlorides). Key reactions include nucleophilic addition, Aldol condensation, Cannizzaro, and Claisen. Very heavily tested in JEE and NEET.
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